You _____ pay too much attention to your reading skill,for it is that important.答案是should,为什么不能填must

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• You _____ pay too much attention to your reading skill,for it is that important.答案是should,为什么不能填must
• You ___ pay too much attention to your reading skill as it is so important.A.cannot B.should C.must D.needn't
• You ____ pay too much attention to your spolen English,as it is so important in our communication.A.can't B.shouldC.mustD.couldn't
• I promise____to the teacher carefully in class.a,listen b,listening c,listens d,to listen